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Business Combinations Other Intangibles by Segment (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite And Indefinite Lived Intangible Assets Gross | $ 483.3 | $ 437.7 | $ 470.9 | $ 475.6
Finite and Indefinite lived Intangible Assets, Additions | 11.3 | 29.5 |  |
Adjustment for fully amortized intangibles | (1.9) |  |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 3.0 | 1.8 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (183.2) | (129.5) | (165.9) | (180.6)
Amortization expense | (17.8) | (17.4) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 1.9 | 69.2 |  |
Impact of exchange rate movements | (1.4) | (0.7) |  |
Net book value as of end of period | 300.1 | 308.2 | 305.0 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 2.7 |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2018 (9 months) | 44.6 |  |  |
2019 | 53.0 |  |  |
2020 | 46.1 |  |  |
2021 | 35.5 |  |  |
2022 | 26.7 |  |  |
2023 | 20.9 |  |  |
Thereafter | 64.5 |  |  |
Total | 291.3 |  |  |
Reportable Subsegments [Member] | Americas [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles |  | 50.0 |  |
Reportable Subsegments [Member] | EMEA [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles |  | 7.7 |  |
Reportable Subsegments [Member] | Asia Pacific [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles |  | 8.0 |  |
Investment Management [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles |  | 0.1 |  |
Mortgage servicing rights [Member] |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2018 (9 months) | 22.4 |  |  |
2019 | 29.2 |  |  |
2020 | 26.8 |  |  |
2021 | 23.0 |  |  |
2022 | 20.1 |  |  |
2023 | 16.6 |  |  |
Thereafter | 48.9 |  |  |
Total | 187.0 |  |  |
Mortgage servicing rights [Member] | Reportable Subsegments [Member] | Americas [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite And Indefinite Lived Intangible Assets Gross | 250.6 | 209.7 | 241.8 | 193.1
Finite and Indefinite lived Intangible Assets, Additions | 10.7 | 20.0 |  |
Adjustment for fully amortized intangibles | (1.9) |  |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.0 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (63.6) | (38.7) | (55.1) | (32.3)
Amortization expense | (10.4) | (9.8) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 1.9 | 3.4 |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Net book value as of end of period | 187.0 | 171.0 |  |
Other Intangible Assets [Member] |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2018 (9 months) | 22.2 |  |  |
2019 | 23.8 |  |  |
2020 | 19.3 |  |  |
2021 | 12.5 |  |  |
2022 | 6.6 |  |  |
2023 | 4.3 |  |  |
Thereafter | 15.6 |  |  |
Total | 104.3 |  |  |
Other Intangible Assets [Member] | Reportable Subsegments [Member] | Americas [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite And Indefinite Lived Intangible Assets Gross | 117.6 | 117.3 | 117.0 | 167.1
Finite and Indefinite lived Intangible Assets, Additions | 0.6 | 0.2 |  |
Adjustment for fully amortized intangibles | 0.0 |  |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.0 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (64.6) | (52.1) | (61.3) | (98.7)
Amortization expense | (3.4) | (3.5) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 0.0 |  |  |
Impact of exchange rate movements | 0.1 | 0.1 |  |
Net book value as of end of period | 53.0 | 65.2 |  |
Other Intangible Assets [Member] | Reportable Subsegments [Member] | EMEA [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite And Indefinite Lived Intangible Assets Gross | 91.9 | 87.0 | 88.8 | 91.1
Finite and Indefinite lived Intangible Assets, Additions | 0.0 | 2.4 |  |
Adjustment for fully amortized intangibles | 0.0 |  |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 3.1 | 1.2 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (47.9) | (34.5) | (43.1) | (38.0)
Amortization expense | (3.3) | (3.5) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 0.0 |  |  |
Impact of exchange rate movements | (1.5) | (0.7) |  |
Net book value as of end of period | 44.0 | 52.5 |  |
Other Intangible Assets [Member] | Reportable Subsegments [Member] | Asia Pacific [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite And Indefinite Lived Intangible Assets Gross | 23.2 | 23.7 | 23.3 | 24.2
Finite and Indefinite lived Intangible Assets, Additions | 0.0 | 6.9 |  |
Adjustment for fully amortized intangibles | 0.0 |  |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (0.1) | 0.6 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (7.1) | (4.2) | (6.4) | (11.5)
Amortization expense | (0.7) | (0.6) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 0.0 |  |  |
Impact of exchange rate movements | 0.0 | (0.1) |  |
Net book value as of end of period | 16.1 | 19.5 |  |
Other Intangible Assets [Member] | Investment Management [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite And Indefinite Lived Intangible Assets Gross | 0.0 | 0.0 | 0.0 | 0.1
Finite and Indefinite lived Intangible Assets, Additions | 0.0 | 0.0 |  |
Adjustment for fully amortized intangibles | 0.0 |  |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.0 |  |
Identified intangibles, with finite useful lives, accumulated amortization | 0.0 | 0.0 | $ 0.0 | $ (0.1)
Amortization expense | 0.0 | 0.0 |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 0.0 |  |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Net book value as of end of period | $ 0.0 | $ 0.0 |  |

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